<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
    /* css属性:
            1. 搞清楚默认值
            2. 搞清楚是否可继承
            3. 搞清楚百分比参照于谁*/


        #app{
            width: 100px;
            height: 100px;
            border: 1px solid;
            background: url("./img/xfz.png") no-repeat;
            /*background-position:10% 10% ;*/
            background-position:-12px -18.8px ;


            /* 100 - 220  -120  -12
             100 - 288  -188  -18.8*/
        }
    </style>
</head>
<body>
    <div id="app">

    </div>
</body>
</html>